Join Date: Dec 2005
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The 'pre heater circuit' is the glow plugs.On a
diesel the glow plugs aren't used very much,so you wouldn't know wether they're working or not.These won't cause your problem,though.
The 'intake air circuit' fault,I'm not sure about.It may be a
boost fault,or any other number of faults,but this,I suspect,is the one causing your problems.
What scanner did your mechanic friend use?
I'd rather push my Alfa than drive a BMW....
Currently in Lagdti's garage:
2004 Saab 9-5 HOT Aero and a 2001 Audi A3 1.8 Turbo